Reinforcement for concrete structures.



PATENTED JULY 9, 1907.

,1 MAXWELL. REINFORCEMENT FOR CONCRETE STRUGTURES.,

APPLICATION FILED NOV. 28, 1906.

UNITED STATES PATENT OFFICE.

DAVID MAXWELL, OF DETROIT, MICHIGAN.

REINFORCEMENT F63 CONCRETE STRUCTURES.

A li ati 518. November 28,1906. serial No. 345.503..

Specification of Letters Patent.

Patented July 9, 1907.

To all whom iii may concern:

Be it known that 1, DAVID MAXWELL, of Detroit, Wayne county, Michigan, have invented a new and useful Reinforcement for Concrete Structures, of which reinforcement of the character described in my pend ing application for patent, SerialNo. 320,725, in which the upper and lower members of the truss are connected by one or more systems of lacing consisting of a continuous piece bent into a series of parallel inclined loops, which are engaged'with the upper and lower members;

The object of my present invention is. more particularly to provide means whereby the bracing is securely locked to one or both of the main truss members, so that any movement thereof relative to said members is prevented.

To this end my invention consists in engaging the loops of the bracing with the flanges of the main truss members in such a manner as to form a lock.

In the accompanying drawings, the numeral 2 designates the upper compression member of the truss, 3 the lower or tension member and 4 the bracing which consists of a continuous piece of metal of small cross-section bent into a series of parallel loops which are engaged with openings or notches 5 in lateral flanges 6 of the members 2 and 3, the transverse portions 6 of said loops lying respectively in contact with the upper and lower surfaces of the flanges. The lopps are inclined at an angle to the members 2 and 3, the inclination being in' opposite directions upon opposite sides of the center of the truss. The notches or openings 5 in the flanges 6 are cut vertically, and are.preierably of just sufficient size to receive the bands of the loops therethrough, said loops being bent at these points to form the short vertis cal portions 7. It will be readily seen thatthis matter of engaging the loops with the flanges 6 forms an efiicient lock which will prevent any movement of the bracing relatively to the main truss members. As i mer locking means, the ends of the bracingsmay be bent through the openings 5 in a vertical direction, as indicated in dotted lines in Fig. 3, and are then bent to' inclincd position, thereby forming the locking bends 7.

In the drawings, I have shown these locking bends at both the upper and lower main truss members 2 and 3, but they may be used at one of such members only. I: have also shown the truss as provided with two series of theloops, one series engaging the flanges at each side of the main truss members.

I do not, however, limit myself to any particular number or arrangement of the bracing loops, since my invention is applicable to all forms of truss reinforcement wherein a looped bracing is threaded through openings in one or more main truss members.

i preferably form the tension members of the truss of a comparatively low-carbon steel in 'order to enable them to receive sudden shocks, while the bracing which carries the steady load is of a comparatively high-carbon steel.

What I claim is: v

1. A metal reinforcement for concrete structures, comprising a truss having a longitudinal member provided with a plurality of open side slots, and a web or bracing portion consisting of amember formed into a series of upwardly-inclined parallel sided loops whose-integral con-,

I necting portions extend parallel to the longitudinal axis of the truss, the lower portions of such loops being engaged with the open side slots and locked therein by kinked portions of the lacing; substantially as described.

2. A metal reinforcement for concrete structures comprising .a truss having a longitudinal member formed with opposite lateral flanges each of which has therein aplurallty of open slots, and a web or bracing composed of continuous members, each of which is'formed into a series of parallel sided loops whose connectingpoi-tions extend par- -allel to the longitudinal axis of the truss, the lower poi tions of said loops being engaged with the openside slots, and formed with looking bends therein; substantially as described. i

3. A metal reinforcement for concrete structures comprising a truss having an upper compression member, a

lower tension member, each of saidmembers having a plurality of open side slots, and a web or bracing portion C011,

sisting of a series of parallel sided loops engaged with the slots and having integral connecting portions extending parallel with the longitudinal axis of the truss, said loops having locking kinks or bends withinthe slots substantially as described.

4. A metal reinforcement for concrete structures, comprising a truss having a longitudinal tension member of relatively low carbon steel and formed with a plurality of open side slots, and a. web or bracing portion consisting of a continuous piece of relatively high carbonsteel bent into a series of parallel sided loops whose connecting portion s-hre parallel to the longitudinal axis of the truss and having k'inked or bent portions which engage the open slots, substantially as described.

' In testimony whereof, I have hereunto set my hand. I

Witnesses:

Louis Soummm, WALTER S. \VHEELER. 

